OBD fault code library

Look up any P or U code to see what it means, what causes it, the parts involved and how it gets fixed.

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Fault codes

P1624 Open or short detected in MIL light circuit
Audi Computer Output Circuit High severity
P1626 Internal malfunction detected in Transmission Control Module
Audi Computer Output Circuit High severity
P1630 Issue in accelerator pedal position sensor
Audi Vehicle Speed and Idle Control System High severity
P1634 Issue in accelerator pedal position sensor
Audi Vehicle Speed and Idle Control System High severity
P1639 Issue in accelerator pedal position sensor
Audi Computer Output Circuit High severity
P1642 Internal malfunction detected in Airbag control module
Audi Computer Output Circuit High severity
P1646 Communication error in AWD system
Audi Computer Output Circuit High severity
P1649 Internal malfunction detected in ABS control module
Audi Computer Output Circuit High severity
P1652 Internal malfunction detected in Transmission control module
Audi Computer Output Circuit High severity
P1655 Internal malfunction detected in AWD control module
Audi Computer Output Circuit High severity
P1659 Short circuit in radiator exhaust system
Audi Auxiliary Emissions Control High severity
P1664 Issue in fuel pump valve
Audi Injector Circuit High severity
P1667 Issue in fuel pump valve (cylinder 2)
Audi Injector Circuit High severity
P1671 Issue in fuel pump valve (cylinder 6)
Audi Injector Circuit High severity
P1674 Internal malfunction detected in Instrument cluster control module
Audi Computer Output Circuit High severity

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